It will be a five year deal for Will Hardy. The Celtics are reportedly looking to fill Hardy's seat from within. Personally I'd prefer Udoka to add some seasoned ex NBA coach in that open spot instead.
Udoka did a great job his first season motivating the team and getting them to buy in together on defense, but the X's and O's, especially down the stretch of games could have been tighter. No shame in having a veteran assistant. A Larry Brown type if you will (or this was like 8 years ago).